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2012 ; 3
(1
): 161-99
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Insect Sex Determination Manipulated by Their Endosymbionts: Incidences,
Mechanisms and Implications
#MMPMID26467955
Kageyama D
; Narita S
; Watanabe M
Insects
2012[Feb]; 3
(1
): 161-99
PMID26467955
show ga
The sex-determining systems of arthropods are surprisingly diverse. Some species
have male or female heterogametic sex chromosomes while other species do not have
sex chromosomes. Most species are diploids but some species, including wasps,
ants, thrips and mites, are haplodiploids (n in males; 2n in females). Many of
the sexual aberrations, such as sexual mosaics, sex-specific lethality and
conversion of sexuality, can be explained by developmental defects including
double fertilization of a binucleate egg, loss of a sex chromosome or
perturbation of sex-determining gene expression, which occur accidentally or are
induced by certain environmental conditions. However, recent studies have
revealed that such sexual aberrations can be caused by various groups of
vertically-transmitted endosymbiotic microbes such as bacteria of the genera
Wolbachia, Rickettsia, Arsenophonus, Spiroplasma and Cardinium, as well as
microsporidian protists. In this review, we first summarize the accumulated data
on endosymbiont-induced sexual aberrations, and then discuss how such
endosymbionts affect the developmental system of their hosts and what kinds of
ecological and evolutionary effects these endosymbionts have on their host
populations.